package com.zuiacsn.forum.interceptor;

import com.zuiacsn.forum.config.AppConfig;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Component
public class LoginInterceptor implements HandlerInterceptor {

    @Value("${bit-forum.login.url}")
    String defaultUrl;

    /**
     * 前置拦截
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        if(session != null && session.getAttribute(AppConfig.USER_SESSION) != null) {
            // 校验通过,放行
            return true;
        }

        if(!defaultUrl.startsWith("/")){
            defaultUrl = "/" + defaultUrl;
        }
        // 不通过,跳转到登录界面
        response.sendRedirect(defaultUrl);
        return false;
    }


}
